Split sieve formed with wires or bars of special profile



Sept. 29, 1925. 1,555,574

R. HERRMANN SPLIT SIEVE FORMED WITH WIRES on BARS 0F SPECIAL PROFILE .Filed May 22, 1925 Patented Sept 29, 1925.

RUDOLF HERRMANN, or nREsDEN-oN-'rE-ELBE, GEBMANY.

SPLIT SIEVFORMED WITH WIRES 0R BARS `0F SPECIAL PROFILE.

Application led Hay 22, 1925. Serial No. 32,218.

. T 0 all whom z'zmay concer-n.:

Be it known that I, RUDOLF. engineer, a subject of the Free 4State of Saxony, German Republic, and resident of Dresden-on-the-Elbe, Free State of Saxony. German Republic, have invented a new and useful Improvement in or Relating to S lit Sieves Formed with Wires or Bars of pecial Profile, of which the following is a specification.

This invention relates to split-sieves grmed with wires or bars of special pro- In the use of sieves of the above indicated kind it is of special importance for the operations of finely sorting, filtering, and mechanically separatingliquids from solids, `that the apertures of the sieves are as uniform as possible and of such nature that a passage of the material through the sieve is only possible up to a definite size of granule or particle; in the operation of filtering and separating liquids from solids it is particularly important to prevent particles of an undesirably large size from passing through the sieve apertures. For this purpose the split-sieves of the usual kind provided with narrow slots do not meet the requirements for the reason that inaccuracies inevitably arise with such sieves, that is to say, the apertures are in some places vtoo narrow and in other places too wide. Furthermore it is not advantageous for the operation of sorting fine material' to make use of the usual kind of split-sieve because lengthy pieces of the material to be sifted and sorted can pass through the long slots, thus causing an irregularity of the sorting which is much more undesirable and disadvantageous in fine sorting than in coarse sorting.

The novelty of the sieves according to the present invention consists herein, that the profile wires or bars are provided with projections, tongues or the like adapted to abut against an adjacent wire or bar, thus forming a series of sifting or sorting apertures of uniform dimensions and enabling any desired subdivision of the mesh slots to be obtained.

When the said subdivision is effected by projections, tongues or the like of a length about equal to the spaces between the said projections, a round or rectangular orice is formed through which only pieces of a completely uniform size can pass on sifting. In a'll cases acompletely uniferm width of mesh slot is obtained. when the profile wires or bars-are assembled, by reason of the projections, tongues,`or the like of each prole wire or bar abutting against the adjacent wire or bar.

The present invention is represented in vvarious forms of construction in the accompanying drawings, in which Figs. l, 2 and 3 represent profile-wires or profile-bars with depressions or grooves arranged on one side of the same;

Fig. 4 shows profile-wires provided with.

depressions or grooves on both sides and arranged opposite to one another;

F1g.,5 shows part of a sieve in which wires or bars provided with depressions or grooves are inserted between plane profile-wires.

Referring to the drawings, a are the profile-wires or bars assembled closely together in a known manner so as to form a splitsieve. For effecting a subdivision of the continuous mesh 'slots b (Figs. l, 2 and 3) the profile bars a. are provided with projections c in such a manner that the said mesh slots of the4 sieve are subdivided into smaller sifting apertures. arranged on the profile-wires can be of various shapes," as represented in Figs. l, Q and 3. In the arrangement shown in Fig. 4. the projections f provided on adjacent profilebars a meet one another.

The subdivision of the mesh slots can also be effected by an inter-mediate bar d inserted between plane profile-bars' a, as shown in Fig. Said intermediate bars are provided with projections e and the apertures between the projections may be of any shape; those illustrated are similar'4 to the apertures shown in Fig. l, so that the mesh slots are subdivided into small sifting apertures by the intermediate bars d. i

WhatI claim is:

1. A split sieve comprising a series of proiie` wires assembled longitudinally in close relation, each of said wires being provided on opposite sides with transversely arranged projections spaced equidistant and adapted to` abut the rejections on the adjacent wire, thereby orming a plurality of sifting apertures of uniform dimensions.

v2. A split sieve comprising a series of pro- The projections tile wires assembled lonfitudinally in close relation, each of said wires being provided with transversely arranged j'uojeotions spaced equidistant and adaptl d to abut the adjacent wire, each of the spaces between said projections being substantially equal to the length of the adjacent projections,

thereby forming a plurality of sifting apertures of unformdimensions.

In testimony, that I claim the foregoing 10 as my invention, I have signed my name this eighth day of May 1925,.

ARUDOLF HERRMANN. 

